2135538 has 32 divisors (see below), whose sum is σ = 4821120. Its totient is φ = 700560.

The previous prime is 2135537. The next prime is 2135563. The reversal of 2135538 is 8355312.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (2135533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3556 + ... + 4112.

It is an arithmetic number, because the mean of its divisors is an integer number (150660).

2^2135538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2135538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2410560).

2135538 is an abundant number, since it is smaller than the sum of its proper divisors (2685582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2135538 is a wasteful number, since it uses less digits than its factorization.

2135538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639 (or 633 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 2135538 is about 1461.3480078339. The cubic root of 2135538 is about 128.7762481439.

The spelling of 2135538 in words is "two million, one hundred thirty-five thousand, five hundred thirty-eight".